<template>
    <div>
        <!-- 面包屑导航栏 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>商品分类</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 添加卡片视图 -->
        <el-card>
            <el-row>
                <el-col>
                    <el-button type="primary" @click="showAddCate">添加分类</el-button>
                </el-col>
            </el-row>
            <!-- 表格渲染数据 -->
            <tree-table :data="cateList" :columns="columns" show-index index-text="#" :expand-type="false" :selection-type="false" :show-row-hover="false" border class="treeTable">
                <template slot="isOk" slot-scope="scope">
                    <i class="el-icon-success" v-if="!scope.row.cat_deleted" style="color: lightgreen"></i>
                    <i class="el-icon-error" v-else style="color: red"></i>
                </template>
                <template slot="order" slot-scope="scope">
                    <el-tag size="mini" v-if="scope.row.cat_level == 0">一级</el-tag>
                    <el-tag size="mini" type="success" v-else-if="scope.row.cat_level == 1">二级</el-tag>
                    <el-tag size="mini" type="warning" v-else>三级</el-tag>
                </template>
                <template slot="operate">
                    <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
                    <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
                </template>
            </tree-table>
            <!-- 分页功能 -->
            <el-pagination
                @size-change="handleSizeChange"
                @current-change="handleCurrentChange"
                :current-page="queryInfo.pagenum"
                :page-sizes="[1, 3, 5, 10]"
                :page-size="queryInfo.pagesize"
                layout="total, sizes, prev, pager, next, jumper"
                :total="this.total">
            </el-pagination>
        </el-card>
        <!-- 添加分类的对话框 -->
        <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateClosed">
            <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
                <el-form-item label="分类名称：" prop="cat_name">
                    <el-input v-model="addCateForm.cat_name"></el-input>
                </el-form-item>
                <el-form-item label="父级分类：">
                    <!-- 级联选择器 -->
                    <el-cascader expand-trigger='hover' v-model="selectedKeys" :options="parentsCateList" :props="cascaderProps" @change="parentsCateChange" clearable ></el-cascader>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addCateDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addCateInfo">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>
<script>
export default {
    data(){
        return {
            queryInfo:{
                type: 3,
                pagenum : 1,
                pagesize: 5
            },
            cateList:[],
            total:0,
            columns:[
                {
                    label: '分类名称',
                    prop: 'cat_name',
                },
                {
                    label:'是否有效',
                    type:'template',
                    template: 'isOk'
                },
                {
                    label:'排序',
                    type:'template',
                    template: 'order'
                },
                {
                    label:'操作',
                    type:'template',
                    template:'operate'
                }
            ],
            addCateDialogVisible: false,
            addCateForm:{
                cat_name:'',
                cat_pid:0,
                cat_level:0
            },
            addCateFormRules:{
                cat_name: [
                    {
                        required: true,
                        message: "请输入分类名称",
                        trigger: "blur"
                    },
                    {
                        min: 3,
                        max: 8,
                        message: "长度在 3 到 8 个字符",
                        trigger: "blur"
                    }
                ]
            },
            parentsCateList:[],
            cascaderProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children',
                checkStrictly:true

            },
            selectedKeys:[]
        }
    },
    created(){
        this.getCateList();
    },
    methods: {
        async getCateList(){
            const {data : res} = await this.$http.get('categories',{params:this.queryInfo});
            if(res.meta.status != 200) return this.$message.error('获取商品分类失败');
            this.cateList = res.data.result;
            this.total = res.data.total;
            console.log(this.cateList);
        },
        handleSizeChange(val){
            this.queryInfo.pagesize = val;
            this.getCateList();
        },
        handleCurrentChange(val){
            this.queryInfo.pagenum = val;
            this.getCateList();
        },
        showAddCate(){
            this.addCateDialogVisible = true;
            this.getParentsCateList();
        },
        async getParentsCateList(){
            const {data : res} = await this.$http.get('categories',{params:{type:2}});
            if(res.meta.status != 200) return this.$message.error('获取父级分类列表失败');
            console.log(res.data);
            this.parentsCateList = res.data;
        },
        //当级联选择器的选择节点发生变化时触发
        parentsCateChange(){
            console.log(this.selectedKeys);
            if(this.selectedKeys.length > 0){
                this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length-1];
                this.addCateForm.cat_level = this.selectedKeys.length;
                return
            }else{
                this.addCateForm.cat_pid = 0;
                this.addCateForm.cat_level = 0;
            }
        },
        addCateInfo(){
            console.log(this.addCateForm);
            this.$refs.addCateFormRef.validate(async valid=>{
                if(!valid) return this.$message.error('输入内容不符合要求')
                const {data : res} = await this.$http.post('categories',this.addCateForm);
                if(res.meta.status != 201) return this.$message.error('添加分类失败');
                this.$message.success('添加分类成功');
                this.getCateList();
                this.addCateDialogVisible = false;
            })
            
        },
        addCateClosed(){
            this.$refs.addCateFormRef.resetFields();
            this.selectedKeys = [];
            this.addCateForm.cat_pid = 0;
            this.addCateForm.cat_level = 0;
        }
    }
}
</script>
<style lang="less" scoped>
    .treeTable{
        margin-top: 15px;
    }
    .el-cascader {
        width: 100%;
    }
</style>